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I have been requested by DHL for the XML-PI Certification as outlined in the attached document.
We request you to print a test label.
Once done, send the test label to DHL with the debug request and response in a text file, and they will provide you with the live credentials for the production mode.
You can get the debug data, by enabling the debug mode in the plugin settings.
To explore more details about the plugins, go check out ELEX WooCommerce DHL Express / eCommerce / Paket Shipping Plugin with Print Label.
You can also check out other WooCommerce and WordPress plugins in ELEX.